1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 #undef _GNU_SOURCE
3 #include <string.h>
4 #include <stdio.h>
5 #include <errno.h>
6 #include "str_error.h"
7
8 /* make sure libbpf doesn't use kernel-only integer typedefs */
9 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
10
11 /*
12 * Wrapper to allow for building in non-GNU systems such as Alpine Linux's musl
13 * libc, while checking strerror_r() return to avoid having to check this in
14 * all places calling it.
15 */
libbpf_strerror_r(int err,char * dst,int len)16 char *libbpf_strerror_r(int err, char *dst, int len)
17 {
18 int ret = strerror_r(err < 0 ? -err : err, dst, len);
19 /* on glibc <2.13, ret == -1 and errno is set, if strerror_r() can't
20 * handle the error, on glibc >=2.13 *positive* (errno-like) error
21 * code is returned directly
22 */
23 if (ret == -1)
24 ret = errno;
25 if (ret) {
26 if (ret == EINVAL)
27 /* strerror_r() doesn't recognize this specific error */
28 snprintf(dst, len, "unknown error (%d)", err < 0 ? err : -err);
29 else
30 snprintf(dst, len, "ERROR: strerror_r(%d)=%d", err, ret);
31 }
32 return dst;
33 }
34